From 98d4f7809d99bbf456f93816ef9895616cdd1b2d Mon Sep 17 00:00:00 2001 From: Adrian Hunter Date: Fri, 22 Sep 2017 15:36:53 +0300 Subject: [PATCH] mmc: mmc: Enable Command Queuing Enable the Command Queue if the host controller supports a command queue engine. It is not compatible with Packed Commands, so make a note of that in the comment. Signed-off-by: Adrian Hunter Reviewed-by: Linus Walleij Signed-off-by: Ulf Hansson --- drivers/mmc/core/mmc.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c index 8d77ddc..8e11526 100644 --- a/drivers/mmc/core/mmc.c +++ b/drivers/mmc/core/mmc.c @@ -1786,6 +1786,23 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr, } /* + * Enable Command Queue if supported. Note that Packed Commands cannot + * be used with Command Queue. + */ + card->ext_csd.cmdq_en = false; + if (card->ext_csd.cmdq_support && host->caps2 & MMC_CAP2_CQE) { + err = mmc_cmdq_enable(card); + if (err && err != -EBADMSG) + goto free_card; + if (err) { + pr_warn("%s: Enabling CMDQ failed\n", + mmc_hostname(card->host)); + card->ext_csd.cmdq_support = false; + card->ext_csd.cmdq_depth = 0; + err = 0; + } + } + /* * In some cases (e.g. RPMB or mmc_test), the Command Queue must be * disabled for a time, so a flag is needed to indicate to re-enable the * Command Queue. -- 2.7.4